Port 1918IBM Tivoli Directory Service (NDS)

Port 1918 is assigned to IBM Tivoli Directory Service (NDS) over TCP and UDP.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 1/10
lookups: 0

also known as can-nds, NDS

Technical Details

what runs on :1918

IBM Tivoli Directory Service (NDS) is registered on port :1918 over tcp and udp. We don't have a technical write-up for it beyond the IANA registry entry.

In nmap's internet-wide scan data this port is found open rarely. What's listening is often not the registered service, so check before you assume.

find what's listening on :1918

this machine

# linux
sudo ss -tulpn 'sport = :1918'

# macos / bsd
sudo lsof -nP -i :1918

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :1918

another host

nmap -sV -p T:1918 <host>
sudo nmap -sU -sV -p U:1918 <host>

run it? the handshake, the implementations you meet in the wild and the flags that matter come from the engineers who do.

add technical details

Security Information

exposure of :1918

risk score

1/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

network services averages 2.7 across 1,440 ports — this one sits 1.7 below.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

no security notes recorded for :1918 yet

known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.

Record

iana registry entry

port: :1918
service: IBM Tivoli Directory Service (NDS)
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: Network Services
usage: The IANA assignment identifies port 1918 as IBM Tivoli Directory Service (NDS) traffic over TCP and UDP. No registered organization is recorded, and the service is rarely observed in internet-wide scans.
lookups: 0rank 993
added: 2026-09-11
updated: 2026-09-11
references: IANA service name registry — port 1918

Something wrong?

This record is maintained by the engineers who use port 1918. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-09-11.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

all 1,440 in network services →

the 8 most looked-up other ports in network services — 1,440 ports carry that label.

port	service	proto	category	risk	views
:9080	Groove RPC	TCPUDP	Web Services	caution	70.8k
:6543	Jetnet	UDP	Network Services	caution	65.3k
:5938	TeamViewer	TCPUDP	Remote Access	caution	65.0k
:8291	Winbox MikroTik Admin	TCP	Security	caution	62.9k
:3233	WhiskerControl Protocol	TCPUDP	Network Services	caution	61.9k
:3268	Microsoft Global Catalog (GC)	TCPUDP	Security	caution	54.6k
:135	Microsoft EPMAP	TCPUDP	Security	caution	51.9k
:3128	Tatsoft Default HTTP Proxy	TCP	Web Services	caution	46.8k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :1918IBM Tivoli Directory Service (NDS)

Technical Details

Security Information

Related Ports

Port 1918IBM Tivoli Directory Service (NDS)